How to make Edge Glow?
This is possibly easier to achieve in post production through the compositor.

You probably don't even need Cycles or "formal rendering" for somethning this simple. You can use the *OpenGL Render active viewport" or animation at the bottom of the 3D view.

Then add the glow effect and colors as desired in the compositor. You can use a Filter > Blur or a Filter > Glow node for this.